JPH01263597A - Automatic heating operation apparatus from cold state to hot state for pwr nuclear plant - Google Patents

Abstract

PURPOSE:To reduce an operating load of operators and to prevent erroneous operation, by dividing the state fro a cold and hot states into several modes and by operating master switches of each mode stepwisely and completing the switching operation automatically. CONSTITUTION:A control part of the first heating mode elevates the temperature of a reactor cooling system (RCS) to the first set temperature and holds it, while that of the second mode elevates a temperature of a heater 4 to a predetermined value and the RCS temperature to the secondary set value, and that of the third mode elevates the RCS temperature further to a predetermined value and pressurizes an RCS pressure to a predetermined value and holds it. Between the second and third heating modes, control parts of a gaseous phase generating mode for a pressurizer, and a separation mode for a residual heat removal system, perform the predetermined procedures. At a start up operation, switches M1-M5 for each modes is operated in turn to heat the system semi-automatically from the cold state to the hot state, or by utilizing an automatic switch AUTO, an automatic heating control can be carried out with a single operation.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention is applied to startup of a pressurized water nuclear power plant to perform heating from a cold state to a hot state in a pressurized water nuclear power plant. This invention relates to an automatic heating operation device for heating.

[Prior Art] When a pressurized water type nuclear power plant is started up, the secondary cooling system is first maintained in a state called a cold state, and then raised to a state called a warm state. In the cold state, the pressurizer is filled with water and the secondary cooling pump is operated. The temperature of the reactor cooling system, that is, the primary cooling system (RCS), is determined by operating a residual heat removal pump to pass water to the residual heat removal cooler, and the flow rate of water is manually adjusted by a residual heat removal cooler outlet flow control valve, and - The pressure of the secondary cooling system (RC8) is maintained at approximately 28 kg/es+2 by the extraction water pressure control valve.

When raised to a warm state by manual operation, the secondary cooling system pressure will be approximately 157.2 k, and the secondary cooling system temperature will be approximately 291.7° or 286.1', which corresponds to the series of steps during startup that are the subject of this application. Heating mode ends.

Heating operations in such pressurized water nuclear power plants were basically performed manually, with some exceptions.

[Problem to be solved by the invention 1 As mentioned above, heating operations in pressurized water nuclear power plants are performed manually; i. The burden of plant operation and monitoring on operators is too great.

ii) There are operation parts that require complicated and advanced techniques, and if operators manually perform such plant operation operations, there is a possibility that errors may occur.

iii. Also, since it is manual, such operation control takes a huge amount of time.

Such problems have been pointed out in the past.

[Means for Solving the Problems] The present invention has been made to eliminate the above-mentioned drawbacks of the conventional technology. It was made to function automatically according to the sequence. To this end, we have introduced a new control system and are making full use of sequence operations.

According to a specific aspect of the invention, there is provided a nuclear reactor, a primary coolant circulation system connected to the reactor and equipped with a pressurizer, and a residual heat removal system and a coolant extraction/filling system connected to the circulation system. In a start-up control device for a pressurized water nuclear power plant having a reactor cooling system (RCS) control section, a residual heat removal flow rate control section,
and an extraction water pressure control unit, the reactor cooling system (RCS)
) a first heating mode control section for increasing and maintaining the temperature up to a first predetermined temperature; a reactor cooling system control section; a pressurizer temperature control section; a filling flow rate control section; and an extraction water pressure control section. a second heating mode control unit for raising the pressurizer temperature to a predetermined temperature and raising and maintaining the reactor cooling system temperature to a second predetermined temperature; and a reactor cooling system temperature control unit. It has a reactor pressure control section, a pressurizer water level control section, and an extraction water pressure control section, and increases the reactor cooling system temperature to a predetermined temperature and the reactor cooling system pressure to a predetermined pressure. Provided is an automatic heating operation device for a pressurized water nuclear power plant from a cold state to a warm state, characterized by comprising a third heating mode control unit for maintaining the heating mode.

According to another aspect of the present invention, during the operations by the second and third heating mode control units, a reactor cooling system temperature control unit, a reactor cooling system pressure control unit, and a pressurizer temperature control unit are provided. It has a pressurizer gas phase generation mode control section for generating a gas phase in the pressurizer, a reactor cooling system temperature control section, and a reactor cooling system pressure control section. The residual heat removal system isolation mode control unit includes a control unit, a pressurizer water level control unit, an extraction flow rate control unit, and an extraction water pressure control unit, and operates by a residual heat removal system isolation mode control unit that performs an isolation operation of the residual heat removal system. An apparatus for automatically heating a pressurized water nuclear power plant from a cold state to a warm state is also provided.

[Operation] Each mode is divided into modes from cold to warm, and each mode is automatically completed by operating the mask switch for each mode in stages.

Since each mode is automated in this way, the operation and burden on the operator is greatly reduced, erroneous operations can be prevented, and monitoring and operation time can be reduced, making it possible to maintain the healthy condition of the equipment. It becomes possible.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. 1st
The figure is a conceptual diagram of the heating mode start switch operated by the operator when automatically heating the wet layer from the cold state. Figure 2 shows the nuclear reactor controlled by the operation of the heating mode start switch shown in Figure 1. FIG. 2 is a conceptual diagram showing a control system of a primary cooling system, and shows only the parts related to implementation of the present application.

In the heating mode start switch shown in FIG. 1, the upper start command switch section 5W-A includes a start switch S1, an off switch S2, and a hold switch S, and a second break point method is used. mode switch section 5W
-H has heating that is operated to perform the operations of heating ■,! The switch M1 and the heating I completion lamp L1 indicating that the operation of the heating I is completed, Heating! A heating ■ switch M2 that is operated to perform the heating ■ operation after the completion lamp L1 lights up, and a heating ■ completion lamp L2 that indicates that the heating ■ operation is completed.
and a pressurizer gas phase generation switch M2 that is operated to perform the pressurizer gas phase generation operation after the heating completion lamp L2 lights up, and a pressurizer gas phase generation switch M2 that is operated to indicate that the pressurizer gas phase generation operation is completed. A pressurizer gas phase generation completion lamp L, an RHR isolation switch M4 that is operated to perform an RHR isolation operation after the pressurizer gas phase generation completion lamp L3 lights up, and an RHR isolation switch M4 that indicates that the RHR isolation operation is completed. RHR isolation/isolation completion lamp furnace shown; a heating switch Ms that is operated to perform the heating operation after the RHR isolation/isolation completion lamp furnace is turned on; and a heating completion lamp indicating that the heating operation has been completed. L% and are shown, so that at startup, by operating these switches M1 to M in order, heating is performed semi-automatically from a cold state to a warm state.

The third stage fully automatic mode switch section 5W-B' has -
A fully automatic switch AUTO is shown that automatically controls heating from cold to hot when operated at a certain temperature, and a switch section 5W-C for setting the temperature increase rate is shown at the fourth stage. .

In FIG. 2, the primary cooling system, that is, the reactor cooling system, is composed of a steam generator (SG) 1, a secondary cooling pump (RCP>2, a reactor vessel (R/V) 3, and a pressurizer 4). Various elements for controlling (RCS) are conceptually shown, and these control elements include residual heat removal (R) (
R) Pump 5, filling cylinder 16, residual heat removal (RHR)
Cooler 7, pressurizer heater 8, demineralization tower 9, volume control tank (VC'I') 9°, and reactor cooling system (RC8)
Atmospheric release valve 10 and steam dump valve 11 that control the temperature of
, a pressurizer spray valve 12 that controls the RC3 pressure, and a filling flow rate control valve 13 that controls the pressurizer water level and filling flow rate.
, an extraction water pressure control valve 14 for controlling the RC8 pressure, extraction flow rate, and extraction pressure, and a residual heat removal (RHR) temperature control valve 15 for controlling the RC8 temperature.

A first low-pressure extraction valve 16, a second low-pressure extraction valve 17, an extraction orifice isolation valve 18°, and an extraction line switching three-way valve 19 for sequence control, a measuring device 30 for measuring pressurizer pressure pp, and RC3. Measuring device ff31 for measuring pressure P
, a measuring device 32 that measures the RC8 temperature Tr, a filling flow rate measuring device 33 that measures the filling flow rate Fc, a measuring device 34 that measures the pressurizer water level 1, and a measuring device 35 that measures the extracted water flow rate F1. , and a measuring device 36 for measuring extraction water pressure and PI.

The operating modes for automatically advancing the heating mode from the initial cold state to the warm state include a fully automatic method by operating the switch AUTO, and a step-by-step manual operation of switches M, ~M. There is a breakpoint method in which manual operations intervene, but in both cases, (A) continuous control that controls analog quantities, and (B) sequence control that performs on-off control of auxiliary equipment in an orderly manner. I am making full use of it.

The breakpoint method will be explained below.

In Figure 2 of the East Enlarged Edition, the initial conditions are -order cooling pump (
RCP) 2 is in operation, and the pressurizer 4 is full of water (
Removal of residual heat (RHR > pump 5) in a state where a gas phase is formed later
The temperature of the RC8 is manually adjusted by operating the RC8, passing water to the residual heat removal cooler 7, and using the residual heat removal temperature control valve 15. In addition, the extraction water pressure control valve 14 controls the RC8 pressure (for example, 2
8kg761@2) is held.

Under these conditions, if you press the heating I switch M1 of the mode switch section 5W-B and also press the start switch S of the start command switch section 5W-A, the mode will switch to the heating I mode. Become. Heating I
The control circuit in the mode is shown in FIG. 3, and the AND circuit 301 ANDs the signal from the heating I switch M1, the signal from the starting switch Sl, and the signal representing the heating I starting condition. Outputs a start command when all signals are satisfied. heating! As a starting condition,
For example, the filling line flow rate control valve front stop valve is fully open, and R
CP sealed water injection line flow control valve front stop valve is fully open, and either low pressure extraction line stop valve-1 or low pressure extraction line stop valve-2 is fully open.If all conditions are satisfied, the AND circuit is completed. When 301 outputs a start command and enters the heating I mode, the following operations occur.

(a-,) In response to the activation command from the AND circuit 301, the RHR flow rate control unit 302 causes the RHR cooler bypass flow rate M control valve 15 to control the RHRf! In addition, the RC3 temperature control section controls the R
Control is performed so that the HR temperature control valve 15' is in the closing direction to increase the RC3 temperature. Also, the degree of increase is R
Temperature increase rate setting unit 5 input to C8 temperature control unit 303
The temperature is increased according to the temperature increase rate setting signal from the W-C. The temperature increase rate setting signal is variable, but is constant at 10°C/h when the RC3 temperature exceeds 77°C.

Further, the extraction water pressure control unit 304 is held at the value at the time when control is started by the activation command.

(a-=) The activation command from the AND circuit 301 is also given to the pressurizer spray valve 12 to fully open the valve 12.

(a-,) - When the temperature T' of the secondary cooling system reaches approximately 80° C., the comparator 305 detects it based on the temperature signal from the RC3 temperature measuring device 32, and outputs a heating I completion signal. The heating f completion signal lights up the heating l completion lamp, and the heating I completion signal is also given to the OR circuit 306, which outputs a holding signal via the AND circuit 307. This holding signal causes the RHR temperature to change. All controls, including control of the control valve 15' to keep the RC3 temperature constant at 80° C., are maintained to maintain the current process state.

(a-,) In addition to the heating ■ completion signal, if an abnormality occurs during heating, a signal representing the heating ■ abnormality is input to the OR circuit 306, and as a result, the AND circuit 30
If the operation signal of the heating I switch M is input to 7, the holding control will be performed in the same way as described above, and the situation at that time will be
I set it to "Auto" to keep it. Examples of abnormal conditions in the heating mode (1) include cases where the RCS pressure is 31 kg/cm'' or more, the RC3 pressure is 22 kg/e+s2 or less, or Tref<Tres -4°C.

Further, even when a signal from the holding switch S shown in FIG. 1 is input to the OR circuit 306, the plant status at that time is held.

(a-5) If the off switch S2, also shown in FIG. 1, is operated, all controls shift from the automated logic to the normal logic.

Note that the operations related to "hold" and "off" are the same in each mode described below.

After bwn starvation mode addition fil mode is achieved, mode switch section 5W
-B's heating ■ switch M2 is pressed and the start switch S1 is pressed to enter the heating ■ mode. The operation of the heating ■ mode is shown in FIG. 4, and the AND circuit 401 receives the operation signal from the heating ■ switch M, the operation signal from the starting switch S1, and the operation signal of FIG. 3 as the heating ■ starting condition. Comparison section 30
Take the AND with the heating ■ completion signal from 5, and when all these signals are satisfied, output the start command for the heating ■ mode. When all the 0 conditions are satisfied, the AND circuit 401 outputs the start command and starts heating. ■When entering the mode, the following operations occur.

(b-+) In response to the activation command from the AND circuit 401, the pressurizer spray valve 12 changes from fully open to fully closed.

(b-i) The start command from the AND circuit 401 is also given to the pressurizer temperature control section 407, which turns on the pressurizer heater 8 and turns on the pressurizer heater 8° with the signal from the AND circuit 409. to raise the temperature of the water in the pressurizer 4.

(b-s) The activation command from the AND circuit 401 operates the RHR cooler outlet flow rate control valve in the first RC8 temperature control unit 402, that is, the control unit (FIG. 4A) of the RHR temperature control valve. The RHR temperature control valve 15 shown in FIG. 2 is in the closing direction, raising the RC8 temperature.

In the control section of the R) IR temperature control valve shown in FIG. 4A, the changeover switch SW has a manual operation signal MANLI,
, or the automation signal from the RHR temperature control valve automation logic circuit CI and supplies it to the RHR temperature control valve 15. Manual operation of selector switch SW
If it is tilted to the U side, manual control similar to the conventional one is performed, but if it is tilted to the automated logic circuit C1 side, automatic control according to the present invention having a PI control function is performed. In the automation logic circuit C3, the temperature increase rate setting signal from the temperature increase rate setting switch section 5W-C shown in FIG. 1 is given to the function generator F+. The function generator F1 generates a gradually increasing temperature function as a reference signal T based on the temperature increase rate setting signal.
ref, to the comparator COM+. The other input of the comparator COM is given the RC3 temperature Tr measured by the measuring device 32, so that the comparator COM+ outputs the deviation signal between the reference signal Tref and the RCS temperature Tr as PI. The signal is output to the controller and applied to the RHR temperature control valve 15, so that the valve 15 is in the closing direction, and in this way, the RC8 temperature is gradually increased.

(b-,) In response to the activation command from the AND circuit 401, the extraction line switching three-way valve 19 is switched from the VCT, ie, the volume control tank 9° side, to the DEM, ie, the demineralization tower 9, and the VCT, ie, the volume control tank 9' side. Provides driving alert.

(b-s) The above operation continues and the RC3 temperature Tr
gradually rises, and the signal from the measuring device 32 causes the RC
3. When it is determined that the temperature Tr has reached approximately 110° C., the second RC8 temperature control unit 405 sequentially temporarily opens the atmosphere release valves 10 to vent gas from the steam line.
℃, control of the atmosphere release valve 10 is started. If the RHR temperature control valve 15 is open at this point, it will be fully closed.

The control of the main steam relief valve, that is, the atmosphere release valve 10, performed by the second RC3 temperature control section 405 will be explained in more detail using FIG. 4B.

In FIG. 4B, the changeover switch SW2 switches between the normal system operation signal (MS pressure control or manual) MANU2 or the automation signal from the atmosphere release valve automation logic circuit C2 and applies it to the atmosphere release valve 10. If the changeover switch SW2 is turned to the normal system operation MANU side, MS pressure control or manual control will be performed as before.
If it is placed on the side of the automation logic circuit C1, automatic control according to the present invention having a PI control function is performed.

In the automation logic circuit C2, the temperature increase rate setting signal from the temperature increase rate setting switch section 5W-C shown in FIG. 1 is applied to the function generator F2. The function generator F2 outputs a gradually increasing temperature function to the comparator C0M2 as a reference signal Tref2 based on the temperature increase rate setting signal. The other input of the comparator COM 2 is given the RC8 temperature Tr measured by the measuring device 32, so that the comparator COM outputs the deviation signal between the reference signal Tret and the RC8 temperature T' as PliIIm. The output signal is output to the air release valve 10 to control the valve 10.

(b4) When the comparator 403 detects the RC3C10 temperature of about 160°C, the signal is given to the filling flow rate control unit 410 via the AND circuit 415, so that the control unit 410 controls the filling flow rate based on the filling flow rate signal Fe. The control valve 13 is controlled to reduce the filling flow rate Fc to about 6 m'/h. Details of the control performed by this filling flow rate control section 410 are shown in FIG. 4C.

4th CQ in the present invention? In the automation control by the automation logic circuit C1 shown in 1, in addition to the conventional pressurizer water level control, filling flow rate control is also performed.In this way, conventionally only water level control was performed, and the set point was determined depending on the plant load. However, with automation according to the present invention,
Perform water level control or filling flow rate control, and set water level L r
ef and the flow rate set point Fref (6 m'/h) are automatically changed and controlled.

In FIG. 4C, the changeover switch SW4 switches between an automation signal from the automation logic L3 or a normal operation signal (pressurizer water level control or manual), and the changeover switch SW switches between water level control and filling flow rate control. For filling flow control in automation signals, the filling flow Fc is determined by the comparator COM s at the flow set point F.
rer, and their deviations are outputted to the filling flow rate control valve 13 under PI amount control, thereby making the filling flow rate about 61113/h as described above.

(b-y) When the comparator 408 detects the pressurizer temperature of 218°C, the pressurizer heater 8'
is turned off, the heating of the pressurizer water is stopped, and the pressurizer heater 8 is controlled by the pressurizer temperature controller 407 to set the pressurizer temperature to 21.
Control at 8°C. Furthermore, when the comparator 411 detects that the temperature of the RC3C10 has reached approximately 165°C, the AND circuit 412
A heating completion signal is output via the OR circuit 413 and an AND circuit 414, and a holding signal is output via the OR circuit 413 and the AND circuit 414, so that the process state at that point is maintained.

After the U mode heating mode is achieved, the mode switch section 5W-
When the pressurizer gas phase generation switch M of H is pressed and the start switch S is pressed, the pressurizer gas phase generation mode is entered. The operation of the pressurizer gas phase generation mode is shown in FIG. 5, and the AND circuit 501 receives the operation signal from the gas phase generation switch M, and
The operation signal from the start switch S1 is ANDed with the heating completion signal from the AND circuit 412 in FIG. 4 as the gas phase generation start condition, and when all these signals are satisfied, the pressurizer gas phase generation mode When all six conditions for outputting a startup command for are satisfied and the AND circuit 501 outputs a startup command and enters the pressurizer gas phase generation mode, the following operations occur.

(e-+> The RC8 temperature Tr (32) is maintained by controlling the atmosphere release valve 10 with the RC8 temperature control section 502, and the RC5 pressure Pr is maintained by the extraction water pressure control valve 14. In this state, the gas phase When the generation mode is activated and a start command from the AND circuit 501 is input to the pressurizer temperature control section 508 via the AND circuit 507, the pressurizer temperature control section 508 causes the pressurizer heater 8 to Based on the signal from the liquidus temperature measuring device 509, the pressurizer heater 8
is controlled at 218°C. Also, at this time, the AND circuit 507
Replacements 8'' and 8'' were brought in at the signal from.

(e-z) The extracted flow rate F1 from the measuring device 35 is sampled by the extracted flow rate sample section 521, and when it is determined by the comparison sections 520 and 519 that the flow rate has become significantly larger than the original value, the extracted flow rate F1 is sent to the pressurizer 4. A signal is output to determine that a gas phase has been generated.

(c--) When it is determined that a gas phase has been generated, the gas phase generation determination signal from the comparator 520.519 is transmitted to the element 518.
As a result, the extraction water pressure control valve 14 switches from RC3 pressure control to extraction flow rate control, and sets the set value F ref of the extraction water flow rate control shown in the fourth Diffi to about 30 m/h. rise to. This creates a deviation between the filling and extraction flow rates to promote gas phase generation.

In the automated control according to the present invention by the automation logic circuit C1 shown within the dotted line in FIG. 4D, the extraction water is controlled not only by the conventional pressure control but also by the extraction water flow rate control. In the past, only pressure control was used and changing the set point was a manual operation, but with automation according to the present invention, pressure control or flow rate control is performed, and the pressure reference point P re
The settings of f and the flow rate reference point F ref are automatically changed and controlled.

In FIG. 4D, the automation signal from the automation logic circuit L4 or the normal operation signal (RC8, extraction pressure control or manual) is switched by the changeover switch SWs,
Further, pressure control or flow rate control is switched by a changeover switch SW6. In flow rate control during automatic operation, the extracted water flow rate F1 in the measuring device 35 is determined by the comparator COM,
is compared with the flow rate set point F ref (30 m3/h), and their deviation is controlled by the PI amount and extracted water pressure control valve 14.
This makes the filling flow rate about 30 m3/h as described above.

(c-4) Furthermore, when the gas phase is generated, the RC8 pressure control is performed by the pressurizer spray valve 12 and the pressurizer heater 8. In other words, when it is determined that a gas phase has been generated,
The gas phase generation determination signal is also given to the RC3C3 pressure control 06 from the element 518, and the RC3C3 pressure control 06 performs RC3 pressure control by controlling the pressurizer spray valve 12 and the pressurizer heater 8.

(c-=) When the pressurizer water level measured by the measuring device t34 falls to about 35% and the signal is input to the pressurizer water level control section 530, the extraction flow rate F in the measuring device 35 decreases to about 35%.
! is reduced to a point where it balances with the filling flow rate Fc in the measuring device 33, and then the changeover switch SW in FIG.
, the control of the filling flow rate control valve 13 is switched from filling flow rate control to pressurizer water level control.

Referring again to FIG. 4C, in the pressurizer water level control, the comparator COM is connected to the pressurizer water level and the water level reference point Lr.
ef is compared and the deviation between the two is output, and after the PI calculation of the deviation, it is compared with the filling extraction ΔF in the comparator COM s, the PI calculation is performed again, and the output is sent to the filling flow rate control valve 13. . As a result, the filling flow rate control valve 13 is controlled by the pressurizer water level.

(c-,) As described above, when the comparator 527 determines that the water level of the pressurizer is approximately 30%, the signal thereof is given to the AND circuit 529 via the AND circuit 528.

If a signal indicating that the flow rate deviation between the filling flow rate and the extraction flow rate is small is input to the other input terminal of the AND circuit 529, the AND circuit 529 outputs a pressurizer gas phase generation mode completion signal. Then, the pressurizer gas phase generation mode is completed.

Further, a holding signal is outputted via the AND circuit 529 and the AND circuit 532.

d. RHR mode After the pressurizer gas phase generation mode is achieved, press the RHR isolation switch M of the mode switch section 5W-B and press the start switch S1 to enter the RHR isolation mode. The operation of the RHR isolation mode is shown in FIGS. 6A and 6B.
A 0 condition that performs an AND operation with the pressurizer gas phase generation completion signal from the AND circuit 529 in FIG. 5 as an HR isolation start condition, and outputs a start command for the RHR isolation mode when all these signals are satisfied. When all are satisfied and the AND circuit 601 outputs a start command and enters the RHR isolation mode, the following operation occurs.

(d−+) First, the RC8 temperature control 604, the RC8 pressure control 606, the pressurizer water level control 608, and the extracted water flow rate control 610 are set to Tref, respectively, at the start of control.
Pref%Lref and F Iref are entered and held at these values during the RHR isolation mode.

In this state, connect the extraction line of RC3 to low pressure extraction (Route I
) to normal extraction (route ■), the start command from the AND circuit 601 is first given to the AND circuit 615, and the control unit 616 controls the extraction orifice isolation valve 18.
is said to be fully opened.

In addition, the start command is issued by AND circuits 617, 619 and 621.
First, the control section 618 performs an operation of closing the first low pressure extraction valve 16 and the second low pressure extraction valve 17 shown in FIG.

(clz) First and second low pressure extraction valves 16 and 17
When the RHR pump 5 is fully closed, an appropriate display means is energized via the AND circuit 619 to issue a command to the operator, who then manually stops the RHR pump 5 and (from the RCS) Close the RHR large mouth valve and isolate the residual heat removal system RHR (block 620 with a dotted line; the breakpoint method is explained here, but in the case of a fully automatic method, the contents of this block 620 are automatically performed) .

(d-z> When the operation of the block 620 is completed, the gate of the AND circuit 621 is opened, and the control unit 6
In order to relieve the pressure of the RHR system, the first and second low pressure extraction valves 16 and 17 are once opened, and then the valves 26 are turned off again.

In addition, blocks 624 and 628 indicated by dotted lines in FIG. 6B
and 631 indicate the case of manual operation.

In this way, the RHR isolation completion condition is determined by the AND circuit 63.
2, the AND circuit 632 outputs an RHR isolation completion signal and the completion lamp L4 lights up. Also, an AND circuit 632, an OR circuit 602, an AND circuit 60
A hold signal is output via 3.

At this point, the signal from the AND circuit 619 is given to the extraction flow 1 control m610 and the extraction water pressure control 611 via the AND circuit 613, so that the extraction water pressure control valve 14 changes from the extraction flow rate control to the extraction water pressure. Switched to control.

This aspect is shown in more detail in FIG. 4D, and the changeover switch SW in FIG. 4D is first switched to the extraction water pressure control side by a signal given from the AND circuit 619 to the control units 610 and 611. This allows the comparator COM t
compares the extracted water pressure P1 measured by the measuring device 36 with the extracted water pressure reference value P ref and outputs a signal representing the deviation, and the deviation signal is subjected to PI calculation and is sent to the extracted water pressure control valve as a control signal. 14, and thus the brew water pressure control valve 14 is controlled by the brew water pressure.

After the RHR isolation mode is achieved, the mode switch section 5
Heating W-B ■Press switch M, start switch S,
Press to enter heating mode. The operation of the heating ■ mode is shown in FIG. 7, and the AND circuit 701 receives the operation signal from the heating ■ switch M9, the operation signal from the starting switch S1, and the AND of FIG. 6B as the heating ■ starting condition. AND with the RHR isolation complete signal from circuit 632;
When all of these signals are satisfied, the 0 conditions for outputting the activation command for the heating mode (2) are added, and when the AND circuit 701 outputs the activation command and enters the heating (2) mode, the following operation occurs.

(e,,,) In response to the signal from the comparator 703 indicating that the RC9 temperature is 160°C or higher and the activation command from the AND circuit 701, the AND circuit 704 starts the RC3 temperature control 705.
As a result, the RC8 temperature control 705 closes the atmosphere release valve, that is, the main steam relief valve 10, and sets the temperature increase rate setting device 5W-C as described above in FIG. 4B.
The RC8 temperature is increased according to a predetermined temperature increase rate set in .

(e--) Also, in response to the activation command from the AND circuit 701, the RC3 pressure control 709 controls the pressurizer heater 8 and the spray 12 based on the RCS pressure setting 708 that outputs a signal corresponding to the RC3 temperature. , R.C.
8 pressure corresponds to RC8 temperature and the pressure is increased.

Control by the RCS pressure control 709 is shown in FIG. 4E. Conventionally, settings were changed manually, but with automation according to the present invention, settings are automatically changed by changes in the signal T rcs from the measuring device 32. I'm trying to control it. That is, comparator COM, has RC8 pressure setting 70
Automatically changing reference or set pressure P from 8
ref and the actual RC3 pressure Pr from the measuring device W31
is input, the two are compared, and the deviation is calculated by PI and output as a control signal. The mode of control is conceptually shown in the lower right corner of FIG. 4E.

(e-3) When the RC3 pressure increases in this way and exceeds 115k, the RC3 pressure becomes RC3 pressure P
Control is shifted from control based on r to control based on pressurizer pressure pp, and the controlled object changes in this way.

(e-4) The comparator 706 determines from the signal from the measuring device 30 that the RC3 pressure Pr has reached 157.2°C, and the RC8 temperature has reached 291.7°C or 286°C.
When the comparator 702 determines from the signal from the measuring device 32 that the temperature has reached approximately 1°C, the AND circuit 707 starts heating
A completion signal is output to light up the completion lamp L, and a hold signal is output via the OR circuit 720 and the AND circuit 721. This means that the series of modes from heating I to heating ■ have all been completed.

In realizing automation according to the present invention, a large amount of continuous analog control and sequence control are utilized.

[Effects of the Invention] As described above, according to the present invention, the mode from the cold state to the hot state is divided into a plurality of modes, and each mode is automatically completed by operating the mode switch in stages, and the entire heating mode is completed. This has the effect of significantly reducing the operation and burden on the operator, preventing erroneous operations, and further reducing operation time, making it possible to maintain the sound condition of the equipment. There is.

[Brief explanation of the drawing]

Fig. 1 is a diagram conceptually showing mode switches for each mode divided by the present invention, Fig. 2 is a diagram conceptually showing a nuclear reactor control system to which the present invention can be applied, and Fig. 3 is a diagram conceptually showing the mode switch for each mode divided by the present invention. Fig. 4 is an action explanatory diagram for explaining control in I mode; Fig. 4 is an action explanatory diagram for explaining control in heating ■ mode;
Figures A to 4E are operation explanatory diagrams for explaining more specific operations of the control unit in each mode, Fig. 5 is an operation explanatory diagram for explaining the control of the pressurizer gas phase generation mode, and Fig. 6A 6B is an action explanatory diagram for explaining the control of the residual heat removal system isolation mode, and FIG. 7 is an action explanatory diagram for explaining the control of the heating mode. is the heating ■ switch, Ll is the heating l completion lamp, M
, is the heating ■ switch, L2 is the heating complete lamp, M3 is the pressurizer gas phase generation switch, L is the pressurizer gas phase generation completion lamp, M is the residual heat removal system isolation switch, L is the residual heat removal system isolation complete Lamp, MS is heating ■ switch, L is heating ■ completion lamp, SL is start switch, S2 is off switch, S3 is hold switch, 1 is steam generator, 2 is primary cooling pump, 3 is reactor vessel, 4 is a pressurizer, 5 is a residual heat removal pump, 6 is a filling pump, 7 is a residual heat removal cooler, 8 is a pressurizer heater, 9 is a desalination tower, 9 is a volume control tank, 10
is an atmospheric release valve, 11 is a steam dump valve, 12 is a pressurizer spray valve, 13 is a filling flow control valve, 14 is an extraction water pressure control valve, 15 is a residual heat removal temperature control valve, 16 is a first low pressure extraction valve, 17 is the second low pressure extraction valve, 18 is the extraction orifice isolation valve, 19 is the extraction line switching three-way valve, 30 is the pressurizer pressure measuring device, 31 is the RC8 pressure measuring device, 32 is the RC9 temperature measuring device, and 33 is the filling A flow rate measuring device, 34 is a pressurizer water level measuring device, 35 is an extracted water flow rate measuring device, and 36 is an extracted water pressure measuring device. Figure 4A Figure 4B Figure 4C

Claims (2)

[Claims] (1) A pressurized water nuclear power plant having a nuclear reactor, a primary coolant circulation system connected to the reactor and equipped with a pressurizer, and a residual heat removal system and a coolant extraction/filling system connected to the circulation system. In the startup control device, the reactor cooling system (RCS) control section, residual heat removal flow rate control section,
and an extraction water pressure control unit, the reactor cooling system (RCS)
) a first heating mode control section for increasing and maintaining the temperature up to a first predetermined temperature; a reactor cooling system control section; a pressurizer temperature control section; a filling flow rate control section; and an extraction water pressure control section. a second heating mode control unit for raising the pressurizer temperature to a predetermined temperature and raising and maintaining the reactor cooling system temperature to a second predetermined temperature; and a reactor cooling system temperature control unit. It has a reactor pressure control section, a pressurizer water level control section, and an extraction water pressure control section, and increases the reactor cooling system temperature to a predetermined temperature and the reactor cooling system pressure to a predetermined pressure. 1. An automatic heating operation device for changing a pressurized water nuclear power plant from a cold state to a warm state, comprising: a third heating mode control unit for holding a pressurized water nuclear power plant; (2) During the operation by the second and third heating mode control sections, the reactor cooling system temperature control section, the reactor cooling system pressure control section, the pressurizer temperature control section, the filling flow rate control section, and the extraction flow rate control section. It has a control unit, a pressurizer gas phase generation mode control unit for generating a gas phase in the pressurizer, a reactor cooling system temperature control unit, a reactor cooling system pressure control unit, a pressurizer water level control unit, and an extraction unit. A pressurized water type according to claim 1, wherein the pressurized water type is operated by: a residual heat removal system isolation mode control unit having a flow rate control unit and an extraction water pressure control unit and performing an isolation operation of the residual heat removal system. Automatic heating operation device for nuclear power plants from cold to warm.